/* roulang page: index */
:root {
      --primary: #0B4F6C;
      --primary-light: #1A6B8A;
      --secondary: #2ECC71;
      --secondary-dark: #27AE60;
      --accent: #F1C40F;
      --bg-light: #F8F9FA;
      --bg-dark: #1E1E1E;
      --text-dark: #1E1E1E;
      --text-muted: #5A6C7D;
      --text-light: #F0F2F5;
      --white: #FFFFFF;
      --border-light: #E9ECEF;
      --shadow-card: 0 12px 28px rgba(11, 79, 108, 0.08);
      --shadow-hover: 0 20px 32px rgba(11, 79, 108, 0.15);
      --radius-md: 16px;
      --radius-xl: 28px;
      --radius-btn: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      --font-number: "DIN Alternate", "Inter", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(11, 79, 108, 0.08);
      transition: var(--transition);
      padding: 16px 0;
    }
    .nav.scrolled {
      background: var(--white);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--text-dark);
      transition: var(--transition);
      font-size: 1rem;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--secondary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 6px 14px rgba(46, 204, 113, 0.3);
    }
    .btn-nav:hover {
      background: var(--secondary-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(46, 204, 113, 0.4);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
        border-radius: 0 0 24px 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .btn-nav {
        display: none;
      }
      .nav-links .btn-nav {
        display: inline-flex;
        width: fit-content;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B4F6C 0%, #083A4A 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, black 30%, transparent);
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .hero-text h1 span {
      color: var(--secondary);
      display: inline-block;
      border-bottom: 3px solid var(--accent);
    }
    .hero-text p {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: var(--transition);
      box-shadow: 0 10px 20px rgba(46, 204, 113, 0.35);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--secondary-dark);
      transform: scale(1.04);
    }
    .btn-outline-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-mockup {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-mockup img {
      max-width: 360px;
      border-radius: 40px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.4);
      transform: perspective(800px) rotateY(-5deg);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .hero-text p {
        margin: 0 auto 24px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: white;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 50px;
    }
    .decor-line {
      width: 60px;
      height: 4px;
      background: var(--secondary);
      margin: 16px auto 32px;
      border-radius: 2px;
    }

    /* 核心优势网格2x3 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-light);
    }
    .feature-icon {
      font-size: 2.8rem;
      color: var(--primary);
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .feature-card:hover .feature-icon {
      transform: translateY(-3px);
      color: var(--secondary);
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(0,0,0,0.2);
    }
    .scenario-img img {
      width: 100%;
      display: block;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-text h3 {
      font-size: 2rem;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }

    /* 数据案例 */
    .stats-band {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin: 40px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--secondary);
    }
    .review-cards {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .review-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      padding: 24px;
      border-radius: 20px;
      flex: 1;
      min-width: 250px;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .review-user i {
      font-size: 2.2rem;
      color: var(--secondary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.2rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.4s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #0B4F6C, #083A4A);
      text-align: center;
      padding: 80px 24px;
      border-radius: 40px;
      margin: 60px auto;
    }
    .cta-block h2 {
      font-size: 2.5rem;
      color: white;
    }

    footer {
      background: var(--bg-dark);
      color: #CCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }